Cisco 642-427 Exam : Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)

642-427
  • Exam Code: 642-427
  • Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
  • Updated: Aug 31, 2026
  • Q & A: 301 Questions and Answers

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Cisco 642-427 Exam Syllabus Topics:

SectionObjectives
Cisco Unified Communications Architecture Troubleshooting- Cluster and server health issues
  • 1. Publisher/subscriber synchronization issues
    • 2. Service activation and dependency problems
      - CUCM core components and services
      • 1. Database and service failure troubleshooting
        • 2. Call processing and call control analysis
          Call Control and Dial Plan Troubleshooting- Call routing failures
          • 1. SIP trunk and gateway routing issues
            • 2. Intra-cluster and inter-cluster routing
              - Dial plan configuration issues
              • 1. Route patterns and translation patterns
                • 2. Calling search space misconfiguration
                  Voice Gateway and Protocol Troubleshooting- Media and codec issues
                  • 1. RTP stream failures
                    • 2. Codec mismatch and negotiation issues
                      - Signaling protocols
                      • 1. MGCP gateway control problems
                        • 2. H.323 gateway troubleshooting
                          • 3. SIP call setup and teardown issues
                            QoS and Network Integration- Voice quality issues
                            • 1. Jitter, latency, and packet loss analysis
                              • 2. QoS marking and prioritization problems
                                Endpoints and Registration Issues- Endpoint performance issues
                                • 1. Phone registration failures
                                  • 2. Device firmware and compatibility issues
                                    - IP phone registration
                                    • 1. Device pool and load balancing problems
                                      • 2. DHCP and TFTP configuration issues
                                        Voicemail and Unified Messaging- Cisco Unity Connection troubleshooting
                                        • 1. MWI (Message Waiting Indicator) failures
                                          • 2. Call handler and routing rules issues

                                            Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:

                                            Question 1

                                            You have received a trouble ticket stating that the MWI light is not coming on for a group of users. Further investigation reveals that the affected users are connected to the same subscriber in the cluster. Users that are connected to other subscribers in the same cluster are not experiencing this issue.
                                            What is causing this problem?

                                            A. The Cisco Unity voice-mail services need to be restarted for the subscriber so all the users will receive proper MWI message indication.
                                            B. The voice-mail ports assigned to the subscriber are down.
                                            C. The MWI numbers for this subscriber have been changed.
                                            D. Database replication has an error or has failed.


                                            Question 2

                                            When a database replication issue is suspected, which three tools can be used to check the database replication status? (Choose three.)

                                            A. Cisco IP Phone Device Stats from the Settings button
                                            B. Cisco Unified Communications Manager RTMT tool
                                            C. Cisco Unified Communications Manager Serviceability interface
                                            D. Cisco Unified OS Administration interface
                                            E. Cisco Unified Communications Manager CLI interface
                                            F. Cisco Unified Reporting


                                            Question 3

                                            You have just obtained a list of the following options:
                                            -All Patterns -Unassigned DN -Call Park -Conference -Directory Number -Translation Pattern -Call Pickup Group -Route Pattern -Message Waiting -Voice Mail -Attendant Console
                                            What have you selected in order to produce this list?

                                            A. Route Plan > Route Plan Report
                                            B. Control Center > Feature Services
                                            C. Dialed Number Analyzer
                                            D. Route Plan > External Route Plan Wizard


                                            Question 4

                                            Users are making calls from Cisco IP Phones that are registered on a Cisco Unified Communications Manager cluster through an H.323 gateway to the PSTN phones. Sometimes these users report that calls are dropped after they have talked for some time. Different Cisco Unified CM servers have been rebooted for testing during production hours. Currently Cisco IOS
                                            12.0 is used on the H.323 gateway.
                                            Which change helps to prevent calls from dropping when a Cisco Unified CM server is rebooted during testing?

                                            A. A misconfiguration of VoIP dial peers to the Cicso Unified CM servers must exist. Reconfigure the VoIP dial peers.
                                            B. Upgrade the gateway Cisco IOS software to a version later than 12.4(4)9T.
                                            C. A misconfiguration of calling search spaces must exist. Reconfigure the CSS.
                                            D. There is no scenario where rebooting an H.323 gateway will allow call survivability.


                                            Question 5

                                            Under normal conditions, what is the Cisco default attenuation level on a gateway?

                                            A. -6
                                            B. -15
                                            C. 0
                                            D. 3


                                            Solutions:

                                            Question 1
                                            Answer: D
                                            Question 2
                                            Answer: B,E,F
                                            Question 3
                                            Answer: A
                                            Question 4
                                            Answer: B
                                            Question 5
                                            Answer: C

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